Improvement in the manufacture of coated sheet-iron trays, platters



UNITED STATES PATENT OFFICE.

JACOB H. ARMBRUSTER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIMSELF AND GEORGE BOOTH & 00., OF SAME PLACE.

IMPROVEMENT IN THE MANUFACTURE OF COATED SHEET-IRON TRAYS, PLATTERS, 81.0.

Specification forming part of Letters Patent No. 117,139, dated July 18, 1871.

To all whom it may concern:

Be it known that I, J ACOB H. ARMBRUSTER, of the city and county of Philadelphia and State of Pennsylvania, have made a new and useful Improvement in the Manufacture of Ooated Sheet- Iron Trays, Platters, and Waiters; and I hereby declare the following to be a full and exact description of the same.

Trays and waiters are now made of sheet-iron by striking up in proper form and covering the surface with Japan, paint, or lacquer. The process of striking up or stamping the metal sometimes strains or cracks it, and corrosion takes place easily at the parts which are strained. The use of paint and varnish is also objectionable, as it often cracks and peels off and exposes the iron, and is easily scratched, and, in use, soon becomes worn or tarnished, so that a sheetiron tray or waiter is soon worn out or greatly deteriorated in appearance.

My invention consists in forming the tray or waiter in the ordinary manner by stamping, and then trimming the edge, and then coating the surface with zinc by the well-known process of galvanizing.

The method of cleaning the surface of iron and applying the coat of zinc being well understood need not be further described. It is, however, necessary that the tray be kept from warping while undergoing the coating process. This I accomplish by heating the tray before immersing it in the bath of zinc, so that it is not subjected to a too sudden change of temperature.

This method of finishing and coating trays closes all fissures and strains in the sheet-iron produced by striking up; the tray is rendered much stronger; the coating will not crack or peel off; and a smooth non-corrodible surface is produced, making the tray or waiter greatly superior to the article now used. It is cheap, sub stantial, and cleanly, and well adapted for kitchen use. All the seams being filled by the zinc, there is no chance for the lodging of water in any part to corrode the iron.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. The improved process herein described for preventing corrosion in sheet-iron platters, trays, and the like, the same consisting in forming the articles by stamping or striking up and coating with zinc, substantially as set forth.

2. A new article of manufacture, a sheet-iron tray, having its surface coated with zinc, as set forth.

JACOB H. ARMBRUSTER.

Witnesses:

J. H. REED, FRANCIS H001). 

